Abstract: The invention concerns a dental root-canal preparing instrument with a grip nd a tool held in the grip. The grip comprises a device indicating how often the instrument already was used. The device includes a displaceable element, such as a ring, shiftable along the grip into various discrete positions, with clearances such as annular channels being provided in axially spaced manner to receive the displaceable element. Following each use, the displaceable element is shifted ahead to another discrete position, whereby the number of uses already having taken place is indicated by the present position of the displaceable element.

Abstract: A dental root-canal preparation instrument includes a grip and a tool contained therein. The grip has a body fitted at its periphery with axially spaced zones preferably in the form of rings projecting above the periphery of the body. The rings are made of silicone rubber to increase grippability when manually grasping the preparation instrument.